CN105800983A - Mineral admixture of concrete, preparation method thereof and concrete - Google Patents
Mineral admixture of concrete, preparation method thereof and concrete Download PDFInfo
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- CN105800983A CN105800983A CN201610128700.8A CN201610128700A CN105800983A CN 105800983 A CN105800983 A CN 105800983A CN 201610128700 A CN201610128700 A CN 201610128700A CN 105800983 A CN105800983 A CN 105800983A
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- concrete
- mineral additive
- calcium silicate
- slag
- concrete mineral
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a mineral admixture of concrete, a preparation method thereof and concrete. The mineral admixture of concrete is characterized in that the mineral admixture of concrete is obtained after treating calcium silicate slag; according to the mass fraction, the moisture content and alkali content of the mineral admixture of concrete are less than 1%; the specific surface area of the mineral admixture of concrete is 650-750m<2>/kg. The mineral admixture of concrete has the advantages that the mineral admixture of concrete can conduce to obviously reducing the heat of hydration of concrete, improving the strength of concrete and enhancing the durability of concrete; with the industrial solid wastes including calcium silicate slag and carbide slag as the raw materials, the mineral admixture of concrete is low in production cost.
Description
Technical field
The present invention relates to a kind of mineral additive, particularly relate to a kind of concrete mineral additive and preparation method thereof and concrete.
Background technology
Along with society significantly develops, concrete is as construction material, and people are increasing to its demand, and prescription is more and more higher, and concrete mineral additive can improve and improve more concrete performances, it has also become the requisite component of concrete particularly high performance concrete.
Some the concrete mineral additives supplied in the market are because of complexity of originating, and processed is not in place, poor with the matching degree of concrete component time actually used, and for the improvement of concrete performance inconspicuous, cost performance is low；Meanwhile, more existing concrete mineral additive such as zeolite powders are that production cost is higher with natural minerals for raw material.
Summary of the invention
The present invention provides a kind of concrete mineral additive and preparation method thereof and concrete, is used for overcoming in prior art concrete mineral additive to the concrete defect that performance improvement degree is not good and production cost is too high.
The present invention provides a kind of concrete mineral additive, and described concrete mineral additive is obtained after treatment by calcium silicate slag；In mass fraction, the moisture content < 1% of described concrete mineral additive, containing alkali content < 1%；Described concrete mineral additive specific surface area is 650～750m2/kg。
Calcium silicate slag is to extract the by-product in alumina process with flyash for raw material, and main mineral constituent therein is beta-dicalcium silicate (β-2CaO SiO2), consistent with a kind of main mineral constituent of the four kinds of essential minerals (tricalcium silicate, dicalcium silicate, tricalcium aluminate, tetra calcium aluminoferrite) in cement, therefore calcium silicate slag is high with concrete matching degree as mineral additive, again because of β-2CaO SiO2Hydration rate and the heat of hydration lower than three kinds of essential minerals of other in cement (tricalcium silicate, tricalcium aluminate, tetra calcium aluminoferrite), therefore calcium silicate slag substitutes cement and adds in concrete and can reduce the concrete entirety heat of hydration.Simultaneously, the present invention is by calcium silicate slag after treatment, to the moisture content of the mineral additive finally given, it is controlled containing alkali content and granularity, specifically, in mass fraction, the moisture content < 1% of mineral additive, containing alkali content < 1%, specific surface area is 650～750m2/ kg, wherein, is with the sodium oxide equivalent (Na in mineral additive containing alkali content2O) for benchmark.Inventor is through big quantity research, after finding to carry out calcium silicate slag to process and control These parameters, the mineral additive obtained can significantly reduce the concrete heat of hydration, improve the durability of concrete later strength and Concrete Structure, wherein, moisture control above-mentioned scope be because moisture too high time, β-2CaO SiO2Caking can be occurred to reduce activity, and this moisture content is also convenient for the follow-up packaging of mineral additive and metering simultaneously.It addition, calcium silicate slag extracts the side-product after aluminium oxide as flyash, it is not only simple and easy to get as raw material, with low cost, additionally it is possible to recycle as raw material, saves natural resources, it is to avoid environmental pollution.
Further, described process includes dealkalize process, drying and processing and grinding process.Due to moisture content for mineral additive in the present invention, carry out state modulator containing alkali content and granularity, therefore can include dealkalize process, drying and processing and grinding for the process of calcium silicate slag and process.For convenient disposal flow process, optimization process effect, the process for calcium silicate slag sequentially can carry out according to the process of dealkalize process, drying and processing and grinding.
Further, described dealkalize processes and includes mixing described calcium silicate slag with carbide slag, water, filter-press dehydration after heating 1～3h, and wherein, the mass ratio of described calcium silicate slag, carbide slag and water is 1:(0.09～0.11): (3.2～4.0).Carbide slag prepares the waste residue after acetylene as carbide hydration reaction, and it is mainly composed of calcium hydroxide (Ca (OH)2), by calcium silicate slag and carbide slag, the stirring of water mixing post-heating, it is possible to effectively reduce the alkali content in calcium silicate slag.Outside except with carbide slag, it is also possible to adopt lime milk solution to carry out dealkalize process.
In dealkalize process, except control the reaction ratio of calcium silicate slag, carbide slag and water according to above-mentioned mass ratio, owing to calcium silicate slag containing Na2O, the Ca (OH) in carbide slag2Can in calcium oxide (CaO), the present invention can also pass through to control CaO and Na2The mol ratio of O is (3～3.5): 1 dealkalize realizing calcium silicate slag processes, concrete, due to Na2The content that O is in calcium silicate slag, CaO is in carbide slag is known, therefore can realize above-mentioned mol ratio by the ratio of control calcium silicate slag with carbide slag.
Further, containing silicon dioxide and calcium oxide in described concrete mineral additive, it is 70～77% that wherein said silicon dioxide and calcium oxide account for the ratio of described concrete mineral additive gross mass.Owing in calcium silicate slag, silicon dioxide and calcium oxide are most of with β-2CaO SiO2The form of mineral exists, for ensureing that described concrete mineral additive contains more than 60% β-2CaO SiO2Mineral, therefore to select silicon dioxide and calcium oxide to account for the original state calcium silicate slag that ratio is 70～77% (before non-dealkalize process) of gross mass.
Further, the density of described concrete mineral additive is 2.9～3.0g/cm3, loosely-packed unit weight is 0.7～0.8g/cm3。
Further, in mass fraction, the moisture content of described calcium silicate slag is 35～40%.And in the butt of described calcium silicate slag, in mass fraction, beta-dicalcium silicate content is 60～65%, containing alkali content (with Na2O is benchmark) it is 2.5～3.5%.
Further, in mass fraction, the moisture content of described carbide slag is 5～10%.And in the butt of described carbide slag, in mass fraction, content >=85% of calcium hydroxide.
The preparation method that the present invention also provides for a kind of any of the above-described described concrete mineral additive, comprises the steps:
1) calcium silicate slag and carbide slag being added in the water that temperature is 85～95 DEG C and generate the first mixed serum, wherein, the mass ratio of described calcium silicate slag, carbide slag and water is 1:(0.09～0.11): (3.2～4.0)；
2) heat described first mixed serum, control described first mixed serum at 85～95 DEG C, stir 1～3h, subsequently described first mixed serum filter-press dehydration is obtained the first filter cake；
3) with step 1) equivalent water dissolution described in the first filter cake generate the second mixed serum, heat described second mixed serum, control described second mixed serum at 85～95 DEG C, stir 20～45min, subsequently described second mixed serum filter-press dehydration is obtained the second filter cake；
4) repeat step 3) 1～3 time, obtain dealkalize calcium silicate slag, in mass fraction, described dealkalize calcium silicate slag containing alkali content < 1%；
5), after being dried by described dealkalize calcium silicate slag, grinding to specific surface area is 650～750m2The powder of/kg, obtains described concrete mineral additive；Wherein, in mass fraction, control described dealkalize calcium silicate slag and dry to moisture content < 1%.
Specifically, in step 4) in, it is possible to by monitoring whether meeting < 1% containing alkali content and determining repetition step 3 of gained filter cake) number of times.Meanwhile, above-mentioned filter pressing operates, drying behaviour does and grinding operation can complete respectively through pressure filter, dehydrator and flour mill, and concrete can be plate and frame type filter-press, rotary dryer and tube mill.
The present invention also provides for a kind of concrete, and including any of the above-described described concrete mineral additive, described concrete mineral additive accounts for the 5～10% of cement quality in concrete.Concrete, concrete also includes other compositions, such as cement, grating stone, medium sand and water, and the mass ratio of cement, grating stone, medium sand and water can be 16.1:43.9:32.3:7.7, described concrete mineral additive is added stirring in concrete with the ratio of cement quality 5～10% and can prepare high performance concrete.
The enforcement of the present invention, at least possesses following advantages:
1, the concrete mineral additive of the present invention is as concrete additive, it is possible to significantly reduce the concrete heat of hydration, improves concrete intensity, the durability of Concrete Structure.
2, the concrete mineral additive preparation of the present invention is simple, adopt industrial solid castoff calcium silicate slag as raw material, and production cost is low, and this mineral additive is powdery, and instant packed, transport and metering use.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, the technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment one
The preparation method of the present embodiment concrete mineral additive, comprises the steps:
1) by 1000kg calcium silicate slag (moisture content 39.6wt%, containing silicon dioxide and calcium oxide 72.7wt% in butt original state calcium silicate slag, beta-dicalcium silicate content is 62.3%, containing alkali content 3.4wt%) it is dissolved in the water of 3200kg95 DEG C, it is subsequently adding carbide slag 110kg (moisture content 5.5wt%, calcium hydroxide content 85.4wt% in butt), obtain mixed serum；
2) temperature of mixed serum is controlled at 90～95 DEG C, stirring reaction 1 hour, obtain the first filter cake with filter press filter-press dehydration；
3) again with water dissolution the first filter cake that 3200kg temperature is 95 DEG C, stir 25 minutes, use filter press filter-press dehydration, obtain the second filter cake；
4) step 3 is repeated) 2 times, obtain dealkalize calcium silicate slag；
After testing, based on the gross weight of mineral additive, this mineral additive is that 0.78wt% is (with Na containing alkali content2The gauge of O)；
5) dealkalize calcium silicate slag filter cake rotary dryer being dried to moisture is after 0.94wt%, and the dealkalize calcium silicate slag 50 minutes after adopting tube mill grinding to dry is until its specific surface area is 681m2/ kg (adopts the ventilative specific surface area measuring instrument detection of Bo Shi), prepares described mineral additive.
The mineral additive that the present embodiment obtains is powdery, after testing: 1) silicon dioxide and calcium oxide gross weight are 75.3wt% in mineral additive；2) adopting the detection of Li Shi method, its density is 2.94g/cm3；3) adopting the detection of standard funnel method, its loosely-packed unit weight is 0.75g/cm3。
The above-mentioned concrete mineral additive prepared is added stirring in common C30 concrete according to the ratio of cement quality 10%, prepares the concrete of the present embodiment.Wherein, the concrete mass ratio consisting of cement, grating stone, medium sand and water of common C30 is 16.1:43.9:32.3:7.7.
Embodiment two
By 1000kg calcium silicate slag (moisture content 35.3wt%, containing silicon dioxide and calcium oxide 75.2wt% in butt original state calcium silicate slag, beta-dicalcium silicate content is 64.5%, containing alkali content 2.7wt%) to be dissolved in 4000kg temperature be in 85 DEG C of water, it is subsequently adding carbide slag 90kg (moisture content 9.4wt%, calcium hydroxide content 86.3wt% in butt), obtain mixed serum；
2) temperature of mixed serum is controlled at 85～90 DEG C, stirring reaction 2 hours, obtain the first filter cake with filter press filter-press dehydration；
3) again with water dissolution the first filter cake that 4000kg temperature is 85 DEG C, stir 40 minutes, use filter press filter-press dehydration, obtain the second filter cake；
4) step 3 is repeated) 2 times, obtain dealkalize calcium silicate slag；
After testing, based on the gross weight of mineral additive, this mineral additive is that 0.64wt% is (with Na containing alkali content2The gauge of O)；
5) dealkalize calcium silicate slag filter cake rotary dryer being dried to moisture is after 0.92wt%, and the dealkalize calcium silicate slag 55 minutes after adopting tube mill grinding to dry is until its specific surface area is 692m2/ kg (adopts the ventilative specific surface area measuring instrument detection of Bo Shi), prepares mineral additive.
The mineral additive that the present embodiment obtains is powdery, after testing: 1) silicon dioxide and calcium oxide gross weight are 76.8wt% in mineral additive；2) adopting the detection of Li Shi method, its density is 2.94g/cm3；3) adopting the detection of standard funnel method, its loosely-packed unit weight is 0.73g/cm3。
The above-mentioned concrete mineral additive prepared is added stirring in common C30 concrete according to the ratio of cement quality 10%, prepares the concrete of the present embodiment.Wherein, the concrete mass ratio consisting of cement, grating stone, medium sand and water of common C30 is 16.1:43.9:32.3:7.7.
Reference examples
Concrete in this reference examples, adopts the I level fine-ground fly-ash meeting GB/T18736 2002 as comparison concrete admixture, according to the ratio of cement quality 10%, this concrete admixture is added stirring in common C30 concrete, prepares the concrete of this reference examples.Wherein, the concrete mass ratio consisting of cement, grating stone, medium sand and water of common C30 is 16.1:43.9:32.3:7.7.
Test example
This test example is with the concrete in above-described embodiment one, embodiment two and reference examples for detection object, and using common C30 concrete as blank example, successively this four examples concrete is carried out performance detection, and testing result is shown in following table one.
The concrete performance parameter of each example of table one
From table one result: the concrete of mineral additive prepared by the admixture present invention can significantly reduce the concrete heat of hydration compared to normal concrete, simultaneously, the mineral additive of the present invention can significantly improve concrete later strength, the durability of Concrete Structure, concrete main performance is improved degree and is substantially better than mineral additive of the prior art by it.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a concrete mineral additive, it is characterised in that described concrete mineral additive is obtained after treatment by calcium silicate slag；
In mass fraction, the moisture content < 1% of described concrete mineral additive, containing alkali content < 1%；Described concrete mineral additive specific surface area is 650～750m2/kg。
2. concrete mineral additive according to claim 1, it is characterised in that described process includes dealkalize process, drying and processing and grinding and processes.
3. concrete mineral additive according to claim 2, it is characterized in that, described dealkalize processes and includes mixing described calcium silicate slag with carbide slag, water, filter-press dehydration after heating 1～3h, wherein, the mass ratio of described calcium silicate slag, carbide slag and water is 1:(0.09～0.11): (3.2～4.0).
4. concrete mineral additive according to claim 1, it is characterized in that, containing silicon dioxide and calcium oxide in described concrete mineral additive, it is 70～77% that wherein said silicon dioxide and calcium oxide account for the ratio of described concrete mineral additive gross mass.
5. concrete mineral additive according to claim 1, it is characterised in that the density of described concrete mineral additive is 2.9～3.0g/cm3, loosely-packed unit weight is 0.7～0.8g/cm3。
6. concrete mineral additive according to claim 1, it is characterised in that in mass fraction, the moisture content of described calcium silicate slag is 35～40%.
7. concrete mineral additive according to claim 6, it is characterised in that in mass fraction, in the butt of described calcium silicate slag, beta-dicalcium silicate content is 60～65%, is 2.5～3.5% containing alkali content.
8. concrete mineral additive according to claim 3, it is characterised in that in mass fraction, calcium hydroxide content >=85% in described carbide slag butt.
9. the preparation method of the concrete mineral additive described in claim 1～8, it is characterised in that comprise the steps:
1) calcium silicate slag and carbide slag being added in the water that temperature is 85～95 DEG C and generate the first mixed serum, wherein, the mass ratio of described calcium silicate slag, carbide slag and water is 1:(0.09～0.11): (3.2～4.0)；
2) heat described first mixed serum, control described first mixed serum at 85～95 DEG C, stir 1～3h, subsequently described first mixed serum filter-press dehydration is obtained the first filter cake；
3) with step 1) equivalent water dissolution described in the first filter cake generate the second mixed serum, heat described second mixed serum, control described second mixed serum at 85～95 DEG C, stir 20～45min, subsequently described second mixed serum filter-press dehydration is obtained the second filter cake；
4) repeat step 3) 1～3 time, obtain dealkalize calcium silicate slag, in mass fraction, described dealkalize calcium silicate slag containing alkali content < 1%；
5), after being dried by described dealkalize calcium silicate slag, grinding to specific surface area is 650～750m2The powder of/kg, obtains described concrete mineral additive；Wherein, in mass fraction, control described dealkalize calcium silicate slag and dry to moisture content < 1%.
10. a concrete, it is characterised in that include the concrete mineral additive described in claim 1～8, described mineral additive accounts in concrete the 5～10% of cement quality.
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| CN201610128700.8A CN105800983B (en) | 2016-03-07 | 2016-03-07 | Concrete mineral additive and preparation method thereof and concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109127676A (en) * | 2018-10-15 | 2019-01-04 | 浙江森友环保成套设备有限公司 | A kind of discarded concrete recovery and processing system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101591150A (en) * | 2008-05-26 | 2009-12-02 | 同方环境股份有限公司 | A kind of method of utilizing silico-calcium slag and carbide slag to produce silicate cement |
| CN104119982A (en) * | 2014-07-23 | 2014-10-29 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | Coal saver for clinker sintering in cement clinker rotary kiln and preparation method of coal saver |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101591150A (en) * | 2008-05-26 | 2009-12-02 | 同方环境股份有限公司 | A kind of method of utilizing silico-calcium slag and carbide slag to produce silicate cement |
| CN104119982A (en) * | 2014-07-23 | 2014-10-29 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | Coal saver for clinker sintering in cement clinker rotary kiln and preparation method of coal saver |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109127676A (en) * | 2018-10-15 | 2019-01-04 | 浙江森友环保成套设备有限公司 | A kind of discarded concrete recovery and processing system |
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